Image forming apparatus

Details Image forming apparatus Image forming apparatus

1999-10-29

2000-10-24

Grainger, Quana M.

Electrophotography

Diagnostics

Document handling

271153, G03G 1500

Patent

active

061379689

ABSTRACT:
There are disposed optical sensors (S1, S2, S3,S4, S5, and S6) outside sheet trays (1, 2, 3). The optical axes of the optical sensors are respectively set in such a manner that they are parallel to their associated up-down tables (1a, 2a, and 3a) and pass upwardly of contact positions (A, B and C) between sheets (P) and sheet supply rollers (20, 21, and 22). Using these optical sensors, the present image forming apparatus is able to detect a first condition based on information as to whether a sheet is positioned at a sheet suppliable position on the up-down table of the sheet tray or not, a second condition based on information as to whether a sheet position restrict member (23) removably mounted on the sheet tray is set properly or not, a third condition based on information as to whether a foreign object has invaded the apparatus main body side or not when the sheet tray was removed from the apparatus main body, and a fourth condition based on information on the warped amount and/or folded amount of the sheet.

REFERENCES:
patent: 4320961 (1982-03-01), Davis et al.
patent: 4734747 (1988-03-01), Okuda et al.
patent: 5398101 (1995-03-01), Takada et al.

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